首页|镍基高温合金低能孪晶界密度与热塑性变形参数的响应关系

镍基高温合金低能孪晶界密度与热塑性变形参数的响应关系

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为深入理解甚至描述热塑性变形过程中低能孪晶界密度(BLD∑3n)的演化,建立以平均晶粒尺寸和储能为变量的改进孪晶密度模型.对于Nimonic 80A高温合金,在温度范围1273～1423 K、应变速率范围0.001～10 s-1下进行等温压缩和EBSD实验,基于EBSD数据统计的晶粒尺寸和BLD∑3n结果对其孪晶密度模型进行求解.通过建立等高线叠加图,揭示BLD∑3n与晶粒尺寸和储能随温度和应变速率变化的对应关系.结果表明,BLD∑3n随储能的增加和晶粒尺寸的减小而增大;高的BLD∑3n和细晶组织对应较低的温度和较高的应变速率.这种对应关系最终可以用Nimonic 80A合金改进孪晶密度模型表示,该模型的预测容差为2.8％.
Correspondence between low-energy twin boundary density and thermal-plastic deformation parameters in nickel-based superalloy
To deeply understand and even describe the evolutions of the low-energy twin boundary density (BLD∑3n) in a thermal-plastic deformation process, an improved twin density model as a function of average grain size and stored energy is developed. For Nimonic 80A superalloy, the model is solved based on the EBSD statistical results of grain size and BLD∑3n in the specimens compressed at temperatures of 1273-1423 K and strain rates of 0.001-10 s-1. The corresponding relationships of BLD∑3n with stored energy and grain size varying with temperature and strain rate are clarified by the superimposed contour plot maps. It is summarized that BLD∑3n increases with increasing stored energy and decreasing grain size, and higher BLD∑3n with finer grains corresponds with lower temperatures and higher strain rates. Such relationships are described by the improved twin density model, and the prediction tolerance of the solved model is limited in 2.8％.

Nimonic 80A superalloytwin boundarymicrostructure evolutiondynamic recrystallizationgrain sizestored energy

权国政、张钰清、张普、马遥遥、王卫永

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重庆大学材料科学与工程学院,重庆 400044

华中科技大学材料成形与模具技术国家重点实验室,武汉 430074

重庆大学土木工程学院,重庆 400045

Nimonic80A高温合金 孪晶界 显微组织演化 动态再结晶 晶粒尺寸 储能

financial supports from Chongqing Basic Research and Frontier Exploration Program, ChinaFundamental Research Funds for the Central Universities, ChinaFundamental Research Funds for the Central Universities, ChinaFundamental Research Funds for the Central Universities, ChinaOpen Fund of State Key Laboratory of Materials Processing and Die & Mould Technology, China

cstc2018jcyjAX04592019CDQYTM0272019CDJGFCL0032018- CDPTCG0001-6P2020-001

2021

10.1016/S1003-6326(21)65508-5

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(2)
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